Sewing-machine shuttle.



No. 808,164. PATENTED DEC. 26, 1905. K. MISGHKR SEWING MACHINE SHUTTLE.

APPLICATION FILED FEB.23, 1904.

2 SHEETSSHEET I.

1. LI. I lurid/44 722127 5 No. 808,164. PATENTED DEG.26,1905.

K. MISGHKE.

SEWING MACHINE SHUTTLE.

APPLICATION FILED FBB23.1904.

2 SHEETS-SHEET 2.

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UNITED STATES OFFICE.

KARL MISGHKE, OF ZURICH, SIVITZERLAND, ASSIGNOR, BY MESNE ASSIGNMENTS, TO THE FIRM OF BIELEFELDER MASGHINENFA BRIK, VORMALS DIlRKOIP & 00., OF BIELEFELD, GERMANY;

SEWING-MACHINE SHUTTLE.

Specification of Letters Patent.

Patented Dec. 26, 1905.

To all whom it may concern.-

Be it known that I, KARL MIso'HKn, a citizen of the Republic of Switzerland, residing at Zurich, Switzerland, have invented new and useful Improvements in Sewing Machine Shuttles, of which the following is a specification.

My invention has relation to sewing-machine shuttles constructed for use with bobbins.

That my invention maybe fully understood I will describe the same in detail, reference being had to the accompanying drawings, in which- Figure 1 is a front end view of a bobbincase and bobbin of a rotary shuttle embodying my invention. Fig. 2 is a sectional view on the line (J D of Fig. 1. Fig. 3 is a rear end view, and Fig. at a side elevation, of the bobbin-case with the bobbin in place. Fig. 5 is a front view showing the shuttle. Fig. 6 is a section on line E F of Fig. 5, and Fig. 7 is a perspective view of the bobbin-case and bobbin detached.

The bobbin-case comprises a shell 7, having but one head 8, which constitutes the front wall of the case, and said head has an axial aperture 13 for the passage of the bobbin or shuttle-thread, and a thread-slot 12, extending tangentially from said aperture to the periphery of said head 8, in the outer face of which is formed a semicircular recess in which is secured, by means of a screw 14, an elastic or resilient discoidal tension-plate 15. The plate 15 has a nearly circular slot 16 formed in it concentric with the thread-aperture 13, whereby a central tongue 19 is formed, said tongue being recessed to form a fork through which the thread 6 passes, while the inner wall of said forked portion impinges on said thread 6, coming from the aperture 13, as clearly shown in Fig. 1, and maintains said thread under proper tension. The tensionvplate 15 has also a peripheral recess 17,

through which the thread 6 passes out of the shuttle.

The shell 7 of the bobbin-case is substantially a skeleton shell, a sufficient portion thereof being removed, as shown at 18, for the insertion of the bobbin, and said shell is slotted at 9 to form two resilient members 9' 9. The shell has, furthermore, edge rccesses 7 .7 to facilitate the removal of the bobbin and a peripheral slot 7 to lighten it. I thus obtain an exceedingly light bobbincase. In practice I prefer to construct the shell 7 in the form of a frustum of a cone, as more clearly shown in Fig. 7, and its upper edges are provided with a groove 11, into which is inserted the flange 10 of the bobbin B. The'bobbin-cavity formed by said shell is of slightly greater depth than the axial length of the bobbin B to leave sufficient space between it and the head 8 of the bobbin-case for the passage of the bobbin-thread 6, as shown in Figs. 2 and 6. In practiceI also prefer to make use of bobbins having flanges of different diameter, as more clearly shown in Fig. 7, thatflange 10 which is secured in groove 11 of the bobbin-case being of somewhat greater diameter than the flange 10, which faces theinner face of thehead 8 of the bobbincase. The object of this is twofold--namely, to more perfectly secure the flange 10 in the groove 11 by slightly spreading the resilient members 9' of the shell-wall 7 and to reduce the distance which the shuttle-thread 6 has to travel over the bobbin-flange '10 to the cen tral aperture or thread-eye 13 in the head 8 of the bobbin-case-though I do not desire to limit myself to this construction, as it is not absolutely necessary, though the diameter of the aforesaid head 8 should of course be sufficiently greater than that of the bobbinflange 10 to prevent frictional contact of the shuttle-thread 6 with the inner face of the shell.

Before the bobbin B is introduced into the bobbin-case the thread 6 is passed through slot 12 into the thread-eye 13, thence over the flange 10 of said bobbin, and after the introduction of the latter said thread is drawn through the fork of the tongue 19 of the tension-plate 15 and carried under said plate and out through the recess 17, and if it becomes necesary from any cause to rcmeve the bobbin 8 the thread 6 may be drawn out of the bobbin-case through slot 12, as will be readily understood.

Although I have described my improved shuttle for use in sewing-machines having a rotary shuttle, I do not desire to limit the invention to rotary-shuttle machines, as my invention may be used in other types of sewing-machinesfor instance, in sewing-machines in which the shuttle receives an oscillating motion.

Having thus described my invention, what I claim as new therein, and desire to secure by Letters Patent, is y 1. In a sewing-machine shuttle, the combination With a bobbin having end flanges; of a bobbin-case having means to hold one of the flanges of the bobbin rigidly to the case and leave the other flange free, thereby leaving a space between this flange and the case, said case having an aperture opposite the free flange and said free flange acting as a threa 1? guide.

2. In a sewing-machine shuttle, the combination with a bobbin having end flanges; of a bobbin-case having one end wall only and means to hold one of the flanges of the bobbin rigidly to the case and leave the other flange free thereby leaving a space between this flange and the end wall, said case having a thread-aperture in the end wall opposite the free flange, and said flange acting as a guide for withdrawing the thread from the bobbin.

3. A sewing-machine shuttle comprising a bobbin and bobbin-case, the latter provided with a thread-aperture in its end wall and with resilient members adapted to grasp one of the bobbin-flanges and hold the bobbin stationary with its opposite flange proximate to the end wall of the case. the last-mentioned flange serving as a guide to guide the thread from the exterior of the bobbin to said threadpassage. l. In a sewing-machine shuttle, a bobbin and a bobbin-case comprising a shell and a head at one end having an axial thread-aperture, said shell provided at its open end with means to secure one of the bobbin-flanges against rotation, the other flange guiding the thread around the bobbin as it is drawn ofl its outside.

5. In a sewing-machine shuttle, a bobbin and a bobbin-case comprising a shell and a head for one end thereof, the open end of said shell having an internal peripheral edge groove for the insertion of one of the flanges of the bobbin to hold the same against rotation, the other flange guiding the thread as it is unwound from the outside of the bobbin.

6. In a sewing-machine shuttle, a bobbin and a bobbin-case comprising a shell of substantially the form of a fr-ustum of a cone and having a portion of its wall cut away for the introduction of a bobbin, and a head at the base of the shell having an axial thread-aperture and a slot extending therefrom to the periphery of such head at a point intermediate the edges of the gap in the shell, the latter provided at its open end with means to secureone of the flanges of the bobbin to hold the same against rotation.

7. In a sewing-machine shuttle, a bobbin and a bobbincase comprising a shell of substantially the form of a frustum of a cone and having a gap in its wall for the introduction of a bobbin, said wall slotted to form resilient members 9, 9", and means at the end of least diameter for securing one of the flanges of the bobbin to hold the same against rotation; in combination with a head at the base of the shell having an axial thread-aperture and a th reading-slot extending from said aperture to the periphery of the head at a point intermediate the edges of the gap in the shell.

8. In a sewing-machine shuttle, a bobbincase comprising a shell of substantially the form of a frustum of a cone and a head at the base thereof provided with an axial threadaperture, said shell provided at its open end with means for securing one of the flanges of a bobbin to hold the same against rotation; in combination with a bobbin having a flange to be secured in the shell, of greater diameter than its other flange. I

9. In a sewing-machine shuttle, a bobbincase comprising a shell of substantially the form of a frustum of a cone and a head at the base thereof provided with an axail threadaperture, said shell having a gap for the introd notion of a bobbin, resilient wall portions and an internal groove at its open end; in combination with a bobbin having one of its flanges of somewhat greater diameter than that of said groove and of greater diameter than its other flange.

In testimony whereof l'have signed my name i to this specification in the presence of two subscribing witnesses.

KARL MISCHKE. W'itnesses:

HY. HUBER, A. LIEBERKNECHT. 

